Reception apparatus, transmission apparatus, and data processing method

ABSTRACT

The present technology relates to a reception apparatus, a transmission apparatus, and a data processing method that enable a frequency scan to be performed at a higher speed. The reception apparatus can receive a broadcast wave, perform the frequency scan on the broadcast wave on the basis of the number of providers information indicating the number of broadcasting providers providing a service in the same frequency band, and generate channel selection information for selecting the service, thereby enabling the frequency scan at a higher speed. The present technology is applicable to, for example, a receiver capable of receiving digital broadcasting.

TECHNICAL FIELD

The present technology relates to a reception apparatus, a transmissionapparatus, and a data processing method, and more particularly to areception apparatus, a transmission apparatus, and a data processingmethod configured to perform a frequency scan at a higher speed.

BACKGROUND ART

In a receiver capable of receiving terrestrial broadcasting, in a casewhere the receiver is used for the first time, it is possible to selecta service by performing a so-called initial scan process and holdingchannel selection information about a selectable service (channel) (forexample, refer to Patent Document 1).

CITATION LIST Patent Document

-   Patent Document 1: Japanese Patent Application Laid-Open No.    2015-073244

SUMMARY OF THE INVENTION Problems to be Solved by the Invention

Now, in the initial scan process, the channel selection information canbe obtained by repeating a frequency scan in each predeterminedfrequency band; however, depending on a mode of use of the frequencyband, the frequency scan cannot be completed in each frequency band evenafter necessary information is acquired, and processing time of theinitial scan process has become longer. Therefore, a proposal forperforming the frequency scan at a higher speed has been desired.

The present technology has been made in view of such a situation, and isintended to enable the frequency scan at a higher speed.

Solutions to Problems

A reception apparatus according to a first aspect of the presenttechnology is a reception apparatus including: a reception unitconfigured to receive a broadcast wave; and a control unit configured toperform a frequency scan on the broadcast wave on the basis of thenumber of providers information indicating the number of broadcastingproviders providing a service in the same frequency band to generatechannel selection information for selecting the service.

The reception apparatus according to the first aspect of the presenttechnology may be an independent apparatus or an internal blockconstituting one apparatus. Also, a data processing method according tothe first aspect of the present technology is a data processing methodcorresponding to the reception apparatus of the first aspect of thepresent technology described above.

In the reception apparatus and the data processing method according tothe first aspect of the present technology, a broadcast wave isreceived, and the frequency scan on the broadcast wave is performed onthe basis of number of providers information indicating the number ofbroadcasting providers providing the service in the same frequency band,and channel selection information for selecting the service isgenerated.

A transmission apparatus according to a second aspect of the presenttechnology is a transmission apparatus including: a generation unitconfigured to generate the number of providers information indicatingthe number of broadcasting providers providing a service in the samefrequency band; and a transmission unit configured to transmit thegenerated number of providers information by a broadcast wave.

The transmission apparatus according to the second aspect of the presenttechnology may be an independent apparatus or may be an internal blockconstituting one apparatus. Also, a data processing method according tothe second aspect of the present technology is a data processing methodcorresponding to the transmission apparatus of the second aspect of thepresent technology described above.

In the transmission apparatus and the data processing method accordingto the second aspect of the present technology, the number of providersinformation indicating the number of broadcasting providers providingthe service in the same frequency band is generated, and the generatednumber of providers information is transmitted by a broadcast wave.

Effects of the Invention

According to the first aspect and the second aspect of the presenttechnology, the frequency scan can be performed at a higher speed.

Note that effects described here are not necessarily limited, and anyone of the effects described in the present disclosure may be obtained.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a diagram illustrating a configuration of one embodiment of atransmission system to which the present technology is applied.

FIG. 2 is a diagram illustrating a configuration example of atransmission apparatus.

FIG. 3 is a diagram illustrating a configuration example of a receptionapparatus.

FIG. 4 is a diagram illustrating a protocol stack of an IP transmissionmethod to which the present technology is applied.

FIG. 5 is a diagram illustrating a structure of an LLS packet.

FIG. 6 is a diagram illustrating an example of syntax of an LLS table.

FIG. 7 is a diagram describing a current initial scan process flow.

FIG. 8 is a diagram describing an initial scan process flow 1 of thepresent technology.

FIG. 9 is a diagram describing an initial scan process flow 2 of thepresent technology.

FIG. 10 is a diagram illustrating a relationship among a broadcasttransmission path, a broadcasting provider, and the LLS.

FIG. 11 is a flowchart describing the initial scan process.

FIG. 12 is a flowchart describing an LLS acquisition process.

FIG. 13 is a flowchart describing a signaling acquisition process.

FIG. 14 is a flowchart describing a transmission and reception process.

FIG. 15 is a diagram illustrating a configuration example of a computer.

MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present technology will be described below withreference to the drawings. Note that the description will be made in thefollowing order.

1. Configuration of System

2. Outline of the Present Technology

3. Specific Example of Initial Scan Process of the Present Technology

4. Initial Scan Process Flow of the Present Technology

5. Modification

6. Configuration of Computer

1. Configuration of System

(Configuration Example of Transmission System)

FIG. 1 is a diagram illustrating a configuration of one embodiment of atransmission system to which the present technology is applied. Notethat the system refers to a logical group of a plurality of apparatuses.

In FIG. 1, the transmission system 1 includes a transmission apparatus10 and a reception apparatus 20. In this transmission system 1, datatransmission conforming to a digital broadcasting standard is performed.

The transmission apparatus 10 is a transmitter that transmits contentvia a transmission path 30. For example, the transmission apparatus 10transmits a broadcast stream including (components of) video, audio, andthe like constituting content such as a broadcast program and asignaling as a broadcast wave via the transmission path 30.

The reception apparatus 20 is a receiver that receives the contenttransmitted via the transmission path 30. For example, the receptionapparatus 20 receives the broadcast wave from the transmission apparatus10, acquires (components of) video, audio, and the like constituting thecontent and the signaling from the broadcast stream, and reproduces thevideo and audio of the content such as a broadcast program.

Note that in the transmission system 1, the transmission path 30 may be,in addition to a terrestrial wave (terrestrial broadcast), for example,satellite broadcast using a broadcasting satellite (BS) or acommunications satellite (CS), or cable broadcast using a cable (CATV:Common Antenna TeleVision) or the like.

(Configuration of Transmission Apparatus)

FIG. 2 is a diagram illustrating a configuration example of thetransmission apparatus 10 of FIG. 1.

In FIG. 2, the transmission apparatus 10 includes a control unit 111, avideo data acquisition unit 112, a video processing unit 113, an audiodata acquisition unit 114, an audio processing unit 115, a subtitlesdata acquisition unit 116, a subtitles processing unit 117, a signalinggeneration unit 118, a signaling processing unit 119, a multiplexer 120,and a transmission unit 121.

The control unit 111 controls an operation of each unit of thetransmission apparatus 10.

The video data acquisition unit 112 acquires video data of content suchas a broadcast program from an external server, a camera, a recordingmedium, or the like, and supplies the video data to the video processingunit 113.

The video processing unit 113 applies, for example, a process such as anencoding process that conforms to a predetermined encoding method to thevideo data supplied from the video data acquisition unit 112, andsupplies a resulting video stream to the multiplexer 120.

The audio data acquisition unit 114 acquires audio data of content suchas a broadcast program from an external server, a microphone, arecording medium, or the like, and supplies the audio data to the audioprocessing unit 115.

The audio processing unit 115 applies, for example, a process such as anencoding process that conforms to a predetermined encoding method to theaudio data supplied from the audio data acquisition unit 114, andsupplies a resulting audio stream to the multiplexer 120.

The subtitles data acquisition unit 116 acquires subtitles data ofcontent such as a broadcast program from an external server, a recordingmedium, or the like, and supplies the subtitles data to the subtitlesprocessing unit 117.

The subtitles processing unit 117 applies, for example, a process suchas an encoding process that conforms to a predetermined encoding methodto the subtitles data supplied from the subtitles data acquisition unit116, and supplies a resulting subtitles stream to the multiplexer 120.

On the basis of data that serves as abase of a signaling obtained froman external server, a recording medium, or the like, the signalinggeneration unit 118 generates the signaling and supplies the signalingto the signaling processing unit 119. Note that the signaling is, forexample, control information to be used for processing such as selectionof a service on a reception side and reproduction of content.

The signaling processing unit 119 processes the signaling supplied fromthe signaling generation unit 118, and supplies a resulting signalingstream to the multiplexer 120.

The multiplexer 120 multiplexes the video stream supplied from the videoprocessing unit 113, the audio stream supplied from the audio processingunit 115, the subtitles stream supplied from the subtitles processingunit 117, and the signaling stream supplied from the signalingprocessing unit 119. The multiplexer 120 supplies a resultingmultiplexed stream to the transmission unit 121.

The transmission unit 121 applies a necessary process (for example, amodulation process and the like) to the multiplexed stream supplied fromthe multiplexer 120, and transmits a resulting broadcast stream as abroadcast wave of digital broadcast via an antenna 131.

The transmission apparatus 10 is configured as described above.

Note that in FIG. 2, although the transmission apparatus 10 is describedto include one apparatus for the sake of convenience of description, thetransmission apparatus 10 on a transmission side can be a systemincluding a plurality of apparatuses that each have a function of ablock of FIG. 2.

(Configuration of Reception Apparatus)

FIG. 3 is a diagram illustrating a configuration example of thereception apparatus 20 of FIG. 1.

In FIG. 3, the reception apparatus 20 includes a control unit 211, amemory 212, an input unit 213, a reception unit 214, a demultiplexer215, a video processing unit 216, a video output unit 217, an audioprocessing unit 218, an audio output unit 219, a subtitles processingunit 220, a display unit 221, and a speaker 222.

The control unit 211 includes, for example, a central processing unit(CPU), a microprocessor, and the like. The control unit 211 controls anoperation of each unit of the reception apparatus 20.

The memory 212 includes, for example, a nonvolatile memory or the likesuch as a non volatile RAM (NVRAM). The memory 212 records various typesof data according to control from the control unit 211.

The input unit 213 includes, for example, an input interface circuit andthe like. The input unit 213 supplies an operation signal to the controlunit 211 in response to a user operation. The control unit 211 controlsan operation of each unit on the basis of the operation signal suppliedfrom the input unit 213.

The reception unit 214 includes, for example, a tuner, demodulator, orthe like. The reception unit 214 applies a necessary process (forexample, a demodulation process and the like) to a broadcast streamobtained from a broadcast wave of digital broadcast received via anantenna 231, and supplies a resulting multiplexed stream to thedemultiplexer 215.

The demultiplexer 215 includes, for example, a main system on chip (SoC)or the like. The demultiplexer 215 divides the multiplexed streamsupplied from the reception unit 214 into a video stream, an audiostream, a subtitles stream, and a signaling stream.

The demultiplexer 215 supplies the video stream, the audio stream, thesubtitles stream, and the signaling stream to the video processing unit216, the audio processing unit 218, the subtitles processing unit 220,and the control unit 211, respectively.

The control unit 211 controls an operation of each unit on the basis ofthe signaling supplied from the demultiplexer 215. For example, thecontrol unit 211 controls the demultiplexer 215 and the like at a timeof initial scan, acquires channel selection information obtained fromthe signaling, and records the channel selection information in thememory 212. Also, for example, at a time of service selection, thecontrol unit 211 controls the demultiplexer 215, a processing unit ofeach component, and the like on the basis of the channel selectioninformation recorded in the memory 212, such that content of the serviceto be selected is reproduced.

The video processing unit 216 includes, for example, a video decoder orthe like that supports a predetermined decoding method. The videoprocessing unit 216 applies, for example, a process such as a decodingprocess that conforms to a predetermined decoding method to the videostream supplied from the demultiplexer 215, and supplies resulting videodata to the video output unit 217.

The video output unit 217 includes, for example, an output interfacecircuit and the like. The video output unit 217 supplies the video datasupplied from the video processing unit 216 to the display unit 221.

The display unit 221 includes, for example, a display such as a liquidcrystal display (LCD) and an organic electroluminescence display (GELD).The display unit 221 displays video of content corresponding to thevideo data supplied from the video output unit 217, such as a broadcastprogram.

The audio processing unit 218 includes, for example, an audio decoder orthe like that supports a predetermined decoding method. The audioprocessing unit 218 applies, for example, a process such as a decodingprocess that conforms to a predetermined decoding method to the audiostream supplied from the demultiplexer 215, and supplies resulting audiodata to the audio output unit 219.

The audio output unit 219 includes, for example, an output interfacecircuit and the like. The audio output unit 219 supplies the audio datasupplied from the audio processing unit 218 to the speaker 222.

The speaker 222 includes, for example, a speaker that supports a 2.0 chstereo. The speaker 222 outputs audio of content corresponding to theaudio data supplied from the audio output unit 219, such as a broadcastprogram.

The subtitles processing unit 220 includes, for example, a subtitlesdecoder or the like that supports a predetermined decoding method. Thesubtitles processing unit 220 applies, for example, a process such as adecoding process that conforms to a predetermined decoding method to thesubtitles stream supplied from the demultiplexer 215, and suppliesresulting subtitles data to the video output unit 217.

The video output unit 217 causes the subtitles corresponding to thesubtitle data supplied from the subtitles processing unit 220 to besuperimposed and displayed on the video corresponding to the video datasupplied from the video processing unit 216. With this arrangement, thesubtitles superimposed on the video of content such as a broadcastprogram is displayed on the display unit 221.

Note that it can be said that in the reception apparatus 20 of FIG. 3, aso-called rendering process is performed by the video processing unit216, the video output unit 217, the audio processing unit 218, the audiooutput unit 219, and the subtitles processing unit 220.

The reception apparatus 20 is configured as described above.

Note that the reception apparatus 20 is configured, for example, as afixed receiver such as a television receiver and a set top box (STB), ora mobile receiver equipped with a tuner such as a mobile phone and asmartphone. Also, the reception apparatus 20 may be a vehicle-mountedapparatus mounted in a vehicle.

Also, in the configuration of FIG. 3, the reception apparatus 20includes the display unit 221 and the speaker 222; however, thereception apparatus 20 may not include the display unit 221 and thespeaker 222. Also, the reception apparatus 20 may be provided with acommunication function for connecting to a communication line such asthe Internet.

2. Outline of the Present Technology

Now, the following describes a case where, as a transmission method, thepresent technology employs not an MPEG2-transport stream (TS) methodthat is currently widely used, but an Internet Protocol (IP)transmission method that uses, for a digital broadcast, an IP packetused in a field of communication. For example, the advanced televisionsystems committee (ATSC) 3.0 which is one of the next-generationterrestrial broadcast standards is also assumed to employ the IPtransmission method and enable provision of more advanced services.

(Protocol Stack)

FIG. 4 is a diagram illustrating a protocol stack of the IP transmissionmethod to which the present technology is applied.

In FIG. 4, the lowest layer is a physical layer of a broadcast. An upperlayer adjacent to this physical layer is a layer 2, and an upper layeradjacent to the layer 2 is an IP layer. Also, an upper layer adjacent tothe IP layer is a user datagram protocol (UDP) layer.

That is, an IP packet including a UDP packet (IP/UDP packet) is placedin a payload of a layer-2 L2 packet (ALP (ATSC Link-Layer Protocol)packet) and encapsulated. Also, an L1 frame (physical frame) of thephysical layer of a broadcast includes a preamble and a data part. Datais mapped in the data part, the data being obtained by adding parity forerror correction to a base band (BB) packet obtained by encapsulating aplurality of L2 packets, and then performing a process regarding thephysical layer such as interleaving and mapping.

Upper layers adjacent to the UDP layer are a low level signaling (LLS),real-time object delivery over unidirectional transport (ROUTE), andMPEG media transport (MMT).

Here, in ATSC 3.0, it is assumed that a low level signaling (LLS) andservice layer signaling (SLS) are used as the signaling. The LLS is asignaling to be transmitted in a layer lower than the SLS. The SLS is asignaling of a service unit. That is, in ATSC 3.0, the signaling in thetransport layer is transmitted in two layers of the LLS and the SLS.

The LLS is stored and transmitted in the IP/UDP packet. The LLS includesmetadata such as a service list table (SLT), a rating region table(RRT), and a common alerting protocol (CAP).

The SLT metadata includes basic information indicating a structure of astream and service in a broadcast network, such as information necessaryfor selecting a service (channel). The RRT metadata includes ratinginformation used for parental control. The CAP metadata includesinformation regarding an emergency alarm message.

Also, the ROUTE is a protocol for streaming file transfer and is anextension of file delivery over unidirectional transport (FLUTE). Withthis ROUTE session, SLS files, DASH segment files (video, audio,caption), and non real time (NRT) content files are transmitted for eachservice.

The SLS is a signaling of a service level and provides information,attribute, and the like necessary for finding and selection of acomponent that belongs to a target service. The SLS includes metadatasuch as user service bundle description (USBD), service-based transportsession instance description (S-TSID), and media presentationdescription (MPD).

The USBD metadata includes information such as an acquisition source ofother metadata.

The S-TSID metadata is an extension of LCT session instance description(LSID) for ATSC 3.0 and is control information for the ROUTE protocol.Also, the S-TSID metadata can identify extended FDT (EFDT) transmittedin the ROUTE session. The EFDT is an extension of a file delivery table(FDT) introduced in the FLUTE and is control information for transfer.

The MPD metadata is control information of video and audio files to beused for streaming delivery conforming to MPEG-DASH. Here, the MPEG-DASHis a streaming delivery standard according to over the top video (OTT-V)and is a standard regarding adaptive streaming delivery using astreaming protocol based on hypertext transfer protocol (HTTP).

According to this MPEG-DASH standard, a manifest file for describingmetadata that is control information for video and audio files, and afile format for transmitting moving image content are prescribed. Here,the former manifest file is referred to as media presentationdescription (MPD), and the latter file format is also referred to as asegment format.

Note that the metadata such as SLT, RRT, and CAP as LLS and metadatasuch as USED, S-TSID, and MPD as SLS can be, for example, text-formatdata described in a markup language such as an extensible markuplanguage (XML).

In this manner, streams of video, audio, and subtitles, streams of SLS,and streams of NRT content transmitted in the ROUTE session are storedin the IP/UDP packet and transmitted. Note that the NRT content iscontent to be delivered by the non real time (NRT) broadcast and isreproduced after being temporarily stored in a storage of the receptionapparatus 20. Also, files other than the NRT content (for example,application files) may be transmitted in the ROUTE session.

Meanwhile, streams of video, audio, and subtitles and SLS streamstransmitted in the MMT session are stored in the IP/UDP packet andtransmitted.

In the IP transmission method to which the present technology isapplied, since the afore mentioned protocol stack is employed, at a timeof selection of the service (channel) provided by the component streamtransmitted in the ROUTE session, the reception apparatus 20 acquiresthe SLS transmitted in the ROUTE session according to the channelselection information obtained from the SLT metadata in the LLS (S1-1,S1-2).

Then, the reception apparatus 20 connects to the component stream of theselected service according to metadata such as USBD, S-TSID, and MPD(S1-3). With this arrangement, the reception apparatus 20 outputs animage and audio of content such as a broadcast program in response to aservice selection operation.

Also, at a time of selection of the service provided by the componentstream transmitted in the MMT session, the reception apparatus 20acquires the SLS transmitted in the MMT session according to the channelselection information obtained from the SLT metadata in the LLS (S2-1,S2-2). Then, the reception apparatus 20 connects to the component streamof the selected service according to various types of metadata (S2-3).With this arrangement, the reception apparatus 20 outputs an image andaudio of content such as a broadcast program in response to a serviceselection operation.

(Structure of LLS Packet)

FIG. 5 is a diagram illustrating a structure of an LLS packet.

As illustrated in FIG. 5, a broadcast stream transmitted in a frequencyband (for example, 6 MHz) corresponding to a predetermined RF channelincludes one or more physical layer pipes (PLP) according to anoperation mode. In the PLP, the LLS stream and streams in the ROUTEsession are transmitted in the IP/UDP packet.

However, in the broadcast stream, the LLS stream is transmitted as onesession with a fixed IP address and port number prescribed in advance,such as an IP address of “224.0.23.60” and a port number of 4937, forexample. Also, the streams in the ROUTE session include componentstreams such as video, audio, and subtitles, and the SLS stream.

Here, if attention is paid to the LLS stream surrounded by dotted line Ain the diagram, one or more ATSC link-layer protocol (ALP) packets areplaced in a data part of an L1 frame of the physical layer, and one ormore LLS packets are placed in a payload part of the ALP packet.

However, since the LLS packets are stored in the IP/UDP packet, an IPheader part (IP_H) and a UDP header part (UDP_H) are added. Also, theLLS packets include an LLS table (LLS_table ( )). The LLS table includesa header part (LLS_H) and a payload part. In the LLS table, varioustypes of header information are placed in the header part, and the LLSsuch as SLT metadata and RRT metadata are placed in the payload part.

FIG. 6 illustrates an example of syntax of the header part and thepayload part of the LLS table.

The header part of the LLS table includes LLS_table_id, provider_id,num_of_provider, and LLS_table_version as header information.

The 8-bit LLS_table_id is an ID for identifying the LLS such as the SLTmetadata and the RRT metadata.

The 8-bit provider_id is an ID for identifying a broadcasting provider(for example, a broadcasting station).

The 4-bit num_of_provider is information indicating the number ofbroadcasting providers (for example, broadcasting stations) that provideservices in the same frequency band (for example, 6 MHz). Hereinafter,this information is also referred to as number of providers information.

The 8-bit LLS_table_version is information indicating a version of theLLS table.

Note that a 4-bit extension area (reserved) is provided in the headerpart of the LLS table.

The payload part of the LLS table is branched to a statement followingcase according to a value of LLS_table_id designated as a controlexpression of a switch statement.

That is, in a case where LLS_table_id is “0x01”, the SLT metadata isplaced in the payload part of the LLS table. Also, in a case whereLLS_table_id is “0x02”, the RRT metadata is placed. In a case whereLLS_table_id is “0x03”, the time information (SystemTime) is placed. Ina case where LLS_table_id is “0x04”, the CAP metadata is placed.

Note that in a case where unsigned integer most significant bit first(uimsbf) is specified as a format in FIG. 6, this means that a bitoperation is performed and the information is handled as an integer.Also, in a case where bit string, left bit first (bslbf) is specified,this means that the information is handled as a bit string.

The LLS table stored in the LLS packet is configured as described above.

In that connection, at a time of initial setting, the receptionapparatus 20 performs an initial scan process, acquires informationindicating services (channels) that can be viewed in a target area, andgenerates channel selection information (channel list) for selecting aservice. Also, in addition to the time of initial setting, for example,in a case where the reception apparatus 20 moves and the viewing areachanges, the reception apparatus 20 performs a rescan process andgenerates the channel selection information (channel list) again.

In the reception apparatus 20, a frequency scan is performed by thereception unit 214 such as a tuner in the initial scan process or therescan process, and after a frequency band of a predetermined RF channelis selected, the SLT metadata and the RRT metadata included in the LLStable are acquired by capturing the LLS stream with the fixed IP addressand port number prescribed in advance. That is, in this frequency scan,the channel selection information (channel list) is obtained by allowingtwo tables of the SLT metadata and the RRT metadata to be acquired asthe LLS.

Here, as a mode of service that can be provided by a broadcast streamtransmitted in the frequency band of one RF channel, three patterns areassumed including, first, one service (channel) operated by onebroadcasting provider, second, two or more services (channels) operatedby one broadcasting provider, and third, two or more services (channels)shared by a plurality of broadcasting providers.

In particular, in the next-generation ATSC 3.0, as a point differentfrom the current ATSC 1.0, an operation is assumed in which a pluralityof services (channels) is transmitted in one RF channel as listed in thesecond and third patterns described above. Note that in a case ofoperating two or more services shared by the plurality of broadcastingproviders listed in the third pattern described above, it is assumedthat the LLS session is also shared.

In the initial scan process and the rescan process, the SLT metadata andthe RRT metadata can be acquired and the channel selection informationcan be obtained by repeating the frequency scan in each predeterminedfrequency band. However, in a case where an operation is performed suchthat a plurality of services (channels) is transmitted in one RFchannel, it is impossible to identify whether all the SLT metadata andRRT metadata have been acquired even after necessary information isacquired in each frequency band. As a result, the reception apparatus 20cannot complete the frequency scan until a timeout occurs, andprocessing time of the initial scan process and the rescan process hasbeen long.

Therefore, a proposal for performing the frequency scan at a higherspeed has been desired. Therefore, in the present technology, it isallowed to specify the number of providers information indicating thenumber of broadcasting providers providing services in the samefrequency band with num_of_provider in the header part of the LLS tabletransmitted in the LLS stream.

With this arrangement, in a case where one or more broadcastingproviders provide one or more services in the same frequency band, whenperforming the initial scan process and the rescan process, thereception apparatus 20 can identify the number of SLT metadata and RRTmetadata to be acquired according to the number of providers informationin each frequency band. As a result, when making a transition betweenthe frequency bands in which the frequency scan is performed, thereception apparatus 20 can make a transition without waiting for atimeout and can perform the frequency scan at a higher speed.

3. Specific Example of Initial Scan Process of the Present Technology

Next, with reference to FIGS. 7 to 9, specific examples of the initialscan process to be performed by the reception apparatus 20 will bedescribed. Here, for the sake of comparison, the current initial scanprocess flow will be first described with reference to FIG. 7, and thenthe initial scan process flows of the present technology will bedescribed with reference to FIGS. 8 and 9.

That is, the current initial scan process is an initial scan process ina case where the number of providers information (num_of_provider) isnot included in the LLS table. Meanwhile, the initial scan process ofthe present technology is an initial scan process in a case where thenumber of providers information (num_of_provider) is included in the LLStable.

(Current Initial Scan Process Flow)

FIG. 7 is a diagram describing the current initial scan process flow.

In FIG. 7, a vertical direction represents the frequency bands forrespective RF channels and the reception apparatus 20 that performs thefrequency scan in the frequency bands, whereas a horizontal directionrepresents time. Note that FIG. 7 illustrates only the frequency bandscorresponding to an RF channel 1 (CH.1) and an RF channel 2 (CH.2) amonga plurality of frequency bands which are subjected to the frequency scanby the reception apparatus 20.

A service of one broadcasting provider is transmitted in each of thefrequency band corresponding to the RF channel 1 (CH. 1) and thefrequency band corresponding to the RF channel 2 (CH. 2). Here, adescription is made with one broadcasting provider of the RF channel 1(CH.1) referred to as a broadcasting station A, and one broadcastingprovider of the RF channel 2 (CH.2) referred to as a broadcastingstation B.

Note that in FIG. 7, “T1” represents a transmission period of the SLTmetadata, and “T2” represents the maximum transmission period of the SLTmetadata. Also, although LLS to be acquired at a time of the initialscan includes the SLT metadata and the RRT metadata, only the SLTmetadata will be described here for simplification of description.

First, in the reception apparatus 20, when an instruction for theinitial scan is given (S11), the frequency band of the RF channel 1(CH.1) is selected from among a plurality of frequency bands (S12). Withthis arrangement, the reception apparatus 20 starts a process on astream transmitted in the frequency band of the RF channel 1 (CH.1)(S13).

Then, the reception apparatus 20 captures the LLS stream transmitted inthe frequency band of the RF channel 1 (CH. 1) according to the fixed IPaddress and port number prescribed in advance (S14). Also, the receptionapparatus 20 performs a filtering process with LLS_table_id,provider_id, and LLS_table_version, and acquires the target SLT metadata(S15).

In this filtering process, the broadcasting provider in the RF channel(for example, broadcasting station) is determined with provider_id, atype of signaling included in the LLS table (for example, SLT metadata)is determined with LLS_table_id, and a version of the signaling isdetermined with LLS_table_version. With this arrangement, a service listof the broadcasting station A to be transmitted in the frequency band ofthe RF channel 1 (CH.1) is obtained (S16).

After that, the reception apparatus 20 continues the process on thestream transmitted in the frequency band of the RF channel 1 (CH. 1).When the transmission period T1 of the SLT metadata elapses, thereception apparatus 20 can capture the LLS stream and acquire the SLTmetadata from the LLS table. However, here, LLS_table_id, provider_id,and LLS_table_version are the same as the LLS table processed in stepS15 described above, and the target SLT metadata has been obtained, andthus the SLT metadata is neglected.

Then, in the reception apparatus 20, when the maximum transmissionperiod T2 of the SLT metadata elapses, the SLT metadata of all thebroadcasting stations to be transmitted in the frequency band of the RFchannel 1 (CH. 1) is completed, and thus the process on the streamtransmitted in the frequency band of the RF channels 1 (CH. 1) isfinished (S17). That is, a timeout occurs when the maximum transmissionperiod T2 of the SLT metadata elapses.

Next, in the reception apparatus 20, among the plurality of frequencybands, the frequency band that is subjected to the frequency scan istransitioned from the RF channel 1 (CH. 1) to the RF channel 2 (CH. 2)(S18). With this arrangement, the reception apparatus 20 starts theprocess on the stream to be transmitted in the frequency band of the RFchannel 2 (CH. 2) (S19).

Then, the reception apparatus 20 captures the LLS stream transmitted inthe frequency band of the RF channel 2 (CH. 2) according to the fixed IPaddress and port number prescribed in advance (S20). Also, the receptionapparatus 20 performs the filtering process with LLS_table_id,provider_id, and LLS_table_version, and acquires the target SLT metadata(S21). With this arrangement, the service list of the broadcastingstation B to be transmitted in the frequency band of the RF channel 2(CH. 2) is obtained (S22).

Repeated detailed description of the subsequent initial scan processwill be omitted. In the RF channel 2 (CH. 2), in a similar manner to theRF channel 1 (CH. 1), when the transmission period T1 of the SLTmetadata elapses, the SLT metadata can be acquired; however, the targetSLT metadata has already been acquired, and thus the SLT metadata isneglected. Then, when the maximum transmission period T2 of the SLTmetadata elapses, all the SLT metadata transmitted in the frequency bandof the RF channel 2 (CH. 2) is completed. Therefore, the process on thestream transmitted in the frequency band of the RF channel 2 (CH. 2) isfinished.

Also, about RF channels after the RF channel 3 (CH. 3) among theplurality of frequency bands, in a similar manner to the RF channel 1(CH. 1) and the RF channel 2 (CH. 2) described above, until the maximumtransmission period T2 of the SLT metadata elapses, the filteringprocess on the LLS table transmitted in the LLS stream is performed, andthe target SLT metadata is acquired. Then, since the service list isobtained in each frequency band by repeating the frequency scan in allthe frequency bands, the channel selection information is generated fromthe list.

The current initial scan process flow has been described above. Sincethe number of providers information (num_of_provider) is not included inthe LLS table in the current initial scan process flow, the receptionapparatus 20 cannot identify whether acquisition of the SLT metadata iscompleted. Therefore, the reception apparatus 20 always has a problem asdescribed above that the scan process in the frequency band of thetarget RF channel cannot be completed until the maximum transmissionperiod T2 of each metadata transmitted as LLS elapses, and the processtime of the initial scan process becomes long.

Note that the initial scan process has been described here, but a caseof the rescan process is also similar. In particular, in a case wherethe reception apparatus 20 is a mobile receiver such as a mobile phoneand a smartphone, or a vehicle-mounted device mounted in a vehicle, whenthe rescan process takes a long time after the viewing area changes,viewing interruption time becomes longer, causing disadvantage for auser.

Therefore, next, with reference to FIGS. 8 and 9, the initial scanprocess flow of the present technology in which the problem of thecurrent initial scan process flow is improved will be described.

(Initial Scan Process Flow 1 of the Present Technology)

FIG. 8 is a diagram describing the initial scan process flow 1 of thepresent technology.

In FIG. 8, in a similar manner to FIG. 7, a vertical directionrepresents the frequency bands for respective RF channels and thereception apparatus 20 that performs the frequency scan in the frequencybands, whereas a horizontal direction represents time. Note that FIG. 8illustrates, among the plurality of frequency bands which are subjectedto the frequency scan by the reception apparatus 20, only the frequencyband corresponding to the RF channel 1 (CH. 1) in which a service of thebroadcasting station A is transmitted and the frequency bandcorresponding to the RF channel 2 (CH. 2) in which a service of thebroadcasting station B is transmitted.

First, in the reception apparatus 20, when the instruction for theinitial scan is given (S31), the frequency band of the RF channel 1(CH.1) is selected from among the plurality of frequency bands (S32).With this arrangement, the reception apparatus 20 starts a process on astream to be transmitted in the frequency band of the RF channel 1(CH.1) (S33).

Then, the reception apparatus 20 captures the LLS stream transmitted inthe frequency band of the RF channel 1 (CH. 1) according to the fixed IPaddress and port number prescribed in advance (S34). Also, the receptionapparatus 20 performs the filtering process with LLS_table_id,provider_id, and LLS_table_version, and acquires the target SLT metadata(S35).

In this filtering process, the broadcasting provider in the RF channel(for example, broadcasting station) is determined with provider_id, thetype of signaling included in the LLS table (for example, SLT metadata)is determined with LLS_table_id, and the version of the signaling isdetermined with LLS_table_version. With this arrangement, the servicelist of the broadcasting station A transmitted in the frequency band ofthe RF channel 1 (CH. 1) is obtained (S36).

Here, other than LLS_table_id, provider_id, and LLS_table_version to beused in the filtering process, num_of_provider is described in the LLStable processed in step S35. This num_of_provider is the number ofproviders information and indicates the number of broadcasting providersin a case where one or more broadcasting providers provide one or moreservices in the same frequency band (RF channel). In the example of FIG.8, in the frequency band corresponding to the RF channel 1 (CH. 1), onlythe service of the broadcasting station A is transmitted, and 1 is setas num_of_provider.

Therefore, if the reception apparatus 20 can acquire only one SLTmetadata of one broadcasting station A according to num_of_providerincluded in the LLS table, the reception apparatus 20 can identify thatacquisition of the SLT metadata transmitted in the frequency bandcorresponding to the RF channel 1 (CH. 1) is completed. That is, whenthe reception apparatus 20 acquires the SLT metadata and the servicelist of the broadcasting station A (S35, S36), this means thatacquisition of the SLT metadata of all the broadcasting stationstransmitted in the frequency band of the RF channel 1 (CH. 1) iscompleted.

Therefore, the reception apparatus 20 ends the process on the streamtransmitted in the frequency band of the RF channel 1 (CH. 1), and thefrequency scan target is transitioned from the RF channel 1 (CH. 1) tothe RF channel 2 (CH. 2) (S37). With this arrangement, the receptionapparatus 20 starts the process on the stream to be transmitted in thefrequency band of the RF channel 2 (CH. 2) (S38).

Then, the reception apparatus 20 captures the LLS stream transmitted inthe frequency band of the RF channel 2 (CH. 2) according to the fixed IPaddress and port number prescribed in advance (S39). Also, the receptionapparatus 20 performs the filtering process with LLS_table_id,provider_id, and LLS_table_version, and acquires the target SLT metadata(S40). With this arrangement, the service list of the broadcastingstation B transmitted in the frequency band of the RF channel 2 (CH. 2)is obtained (S41).

In addition, also here, in the example of FIG. 8, in the frequency bandcorresponding to the RF channel 2 (CH. 2), only the service of thebroadcasting station B is transmitted, and 1 is set as num_of_provider.

Therefore, if the reception apparatus 20 can acquire only one SLTmetadata of one broadcasting station B according to num_of_providerincluded in the LLS table, the reception apparatus 20 can identify thatacquisition of the SLT metadata transmitted in the frequency bandcorresponding to the RF channel 2 (CH. 2) is completed. That is, whenthe reception apparatus 20 obtains the SLT metadata and obtains theservice list of the broadcasting station B (S40, S41), this means thatacquisition of the SLT metadata of all the broadcasting stationstransmitted in the frequency band of the RF channel 2 (CH. 2) iscompleted.

Although repeated detailed description of the subsequent initial scanprocess will be omitted, also about the RF channels after the RF channel3 (CH. 3) among the plurality of frequency bands, in a similar manner tothe RF channel 1 (CH. 1) and the RF channel 2 (CH. 2) described above,the filtering process on the LLS table transmitted in the LLS stream isperformed until the SLT metadata corresponding to the number ofbroadcasting providers indicated by the number of providers information(num_of_provider) is acquired, and the target SLT metadata is acquired.Then, by repeating the frequency scan in all the frequency bands, theservice list is obtained for each frequency band, and the channelselection information is generated from the list.

The initial scan process flow 1 of the present technology has beendescribed above. In the initial scan process flow 1 of the presenttechnology, since the number of providers information (num_of_provider)is included in the LLS table, with this number of providers information(num_of_provider), it is possible to determine whether there is stillSLT metadata to be checked for acquisition (update). Then, while thefrequency scan on the target RF channel is continued in a case wherethere is SLT metadata that has not been checked yet, in a case where allthe SLT metadata to be transmitted in the target RF channel has beenacquired, the frequency scan on the target RF channel is finished,transition to the next RF channel is made, and the frequency scan on thenext RF channel is performed.

Therefore, in the initial scan process flow 1 of the present technology,as in the current initial scan process flow described above, the RFchannel to be subjected to the frequency scan is transitioned withoutwaiting for a timeout due to the maximum transmission period T2 of eachmetadata to be transmitted as LLS, and thus the frequency scan can beperformed at a higher speed.

(Initial Scan Process Flow 2 of the Present Technology)

FIG. 9 is a diagram describing an initial scan process flow 2 of thepresent technology.

In FIG. 9, in a similar manner to FIG. 8, a vertical directionrepresents the frequency bands for respective RF channels and thereception apparatus 20 that performs the frequency scan in the frequencybands, whereas a horizontal direction represents time. Note that FIG. 9illustrates, among the plurality of frequency bands which are subjectedto the frequency scan by the reception apparatus 20, only the frequencyband corresponding to the RF channel 1 (CH. 1) in which services of thebroadcasting station A and the broadcasting station B are transmitted,and the frequency band corresponding to the RF channel 2 (CH. 2) inwhich a service of the broadcasting station C is transmitted.

First, in the reception apparatus 20, when an instruction for theinitial scan is given (S51), the frequency band of the RF channel 1(CH. 1) is selected from among the plurality of frequency bands (S52).With this arrangement, the reception apparatus 20 starts a process on astream to be transmitted in the frequency band of the RF channel 1(CH. 1) (S53).

Then, the reception apparatus 20 captures the LLS stream transmitted inthe frequency band of the RF channel 1 (CH. 1) according to the fixed IPaddress and port number prescribed in advance (S54). Also, the receptionapparatus 20 performs the filtering process with LLS_table_id,provider_id, and LLS_table_version, and acquires the target SLT metadata(S55). With this arrangement, the service list of the broadcastingstation A to be transmitted in the frequency band of the RF channel 1(CH. 1) is obtained (S56).

Here, other than LLS_table_id, provider_id, and LLS_table_version to beused in the filtering process, num_of_provider is described in the LLStable processed in step S55. In the example of FIG. 9, in the frequencyband corresponding to the RF channel 1 (CH. 1), the service of thebroadcasting station A and the service of the broadcasting station B aretransmitted, and 2 is set as num_of_provider.

Therefore, if the reception apparatus 20 does not acquire the SLTmetadata of another broadcasting station (broadcasting station B) otherthan the SLT metadata of the broadcasting station A according tonum_of_provider included in the LLS table, the reception apparatus 20can identify that acquisition of the SLT metadata transmitted in thefrequency band corresponding to the RF channel 1 (CH. 1) is notcompleted.

Therefore, the reception apparatus 20 continues the process on thestream transmitted in the frequency band of the RF channel 1 (CH. 1),and captures the LLS stream transmitted in the frequency band of the RFchannel 1 (CH. 1) (S57). In addition, the reception apparatus 20performs the filtering process with LLS_table_id, provider_id, andLLS_table_version, and obtains the target SLT metadata (S58). With thisarrangement, the service list of the broadcasting station B transmittedin the frequency band of the RF channel 1 (CH. 1) is obtained (S59).

With this arrangement, since the reception apparatus 20 has acquired theSLT metadata of the two broadcasting stations including the SLT metadataof the broadcasting station A and the SLT metadata of the broadcastingstation B, this means that acquisition of the SLT metadata of all thebroadcasting stations to be transmitted in the frequency band of the RFchannel 1 (CH. 1) is completed.

Therefore, the reception apparatus 20 ends the process on the stream tobe transmitted in the frequency band of the RF channel 1 (CH. 1), andthe frequency scan target is transitioned from the RF channel 1 (CH. 1)to the RF channel 2 (CH. 2) (S60). With this arrangement, the receptionapparatus 20 starts the process on the stream to be transmitted in thefrequency band of the RF channel 2 (CH. 2) (S61).

Then, the reception apparatus 20 captures the LLS stream transmitted inthe frequency band of the RF channel 2 (CH. 2) according to the fixed IPaddress and port number prescribed in advance (S62). Also, the receptionapparatus 20 performs the filtering process with LLS_table_id,provider_id, and LLS_table_version, and acquires the target SLT metadata(S63). With this arrangement, the service list of the broadcastingstation C transmitted in the frequency band of the RF channel 2 (CH. 2)is obtained (S64).

Also here, in the example of FIG. 9, in the frequency band correspondingto the RF channel 2 (CH. 2), only the service of the broadcastingstation C is transmitted, and 1 is set as num_of_provider.

Therefore, if the reception apparatus 20 can acquire only one SLTmetadata of one broadcasting station C according to num_of_providerincluded in the LLS table, the reception apparatus 20 can identify thatacquisition of the SLT metadata transmitted in the frequency bandcorresponding to the RF channel 2 (CH. 2) is completed. That is, whenthe reception apparatus 20 has acquired the SLT metadata and the servicelist of the broadcasting station C (S63, S64), this means thatacquisition of the SLT metadata of all the broadcasting stationstransmitted in the frequency band of the RF channel 2 (CH. 2) iscompleted.

Although repeated detailed description of the subsequent initial scanprocess will be omitted, also about the RF channels after the RF channel3 (CH. 3) among the plurality of frequency bands, in a similar manner tothe RF channel 1 (CH. 1) and the RF channel 2 (CH. 2) described above,the filtering process on the LLS table to be transmitted in the LLSstream is performed until the SLT metadata corresponding to the numberof broadcasting providers indicated by the number of providersinformation (num_of_provider) is acquired, and the target SLT metadatais acquired. Then, by repeating the frequency scan in all the frequencybands, the service list is obtained for each frequency band, and thechannel selection information is generated from the list.

The initial scan process flow 2 of the present technology has beendescribed above. In the initial scan process flow 2 of the presenttechnology, since the number of providers information (num_of_provider)is included in the LLS table, with this number of providers information(num_of_provider), it is possible to determine whether there is stillSLT metadata to be checked for acquisition (update). Then, while thefrequency scan of the target RF channel is continued in a case wherethere is SLT metadata that has not been checked yet, in a case where allthe SLT metadata to be transmitted in the target RF channel has beenacquired, the frequency scan of the target RF channel is finished,transition to the next RF channel is made, and the frequency scan on thenext RF channel is performed.

Therefore, in the initial scan process flow 2 of the present technology,as in the current initial scan process flow described above, the RFchannel to be subjected to the frequency scan is transitioned withoutwaiting for a timeout due to the maximum transmission period T2 of eachmetadata transmitted as LLS, and thus the frequency scan can beperformed at a higher speed.

Note that in the initial scan process flows 1 and 2 of the presenttechnology, the initial scan process has been described, but the rescanprocess is also similar. In addition, in order to simplify thedescription, the description of a case where only the SLT metadata isacquired has been made, but actually, the RRT metadata is also acquired,and the channel selection information is generated from the SLT metadataand the RRT metadata.

(Relationship Among Broadcast Transmission Path, Broadcasting Provider,and LLS)

Next, with reference to FIG. 10, the relationship among the broadcasttransmission path, the broadcasting provider, and LLS will be described,the relationship being a premise for the initial scan process flowdescribed above.

The relationship between the broadcast stream that serves as a broadcasttransmission path and the broadcasting provider is illustrated in FIG.10. One or more broadcasting providers can provide one or more broadcastservices (services) to one broadcast stream.

However, this broadcast stream represents a stream to be transmitted ina frequency band (for example, 6 MHz) corresponding to a predeterminedRF channel (RF_channel). One or more broadcasting providers provide oneor more broadcast services (services) in the same frequency band (forexample, 6 MHz).

Also, regarding the relationship between the broadcast stream and LLS,for one broadcast stream, an LLS table that stores one signaling istransmitted in the LLS stream. That is, the signaling to be transmittedas LLS is individually stored in (the payload part of) the LLS table andtransmitted.

Therefore, even with the same type of signaling, a plurality ofsignalings provided by different broadcasting providers is notcollectively stored in one LLS table and transmitted. For example, aplurality of SLT metadata provided by different broadcasting providersis not transmitted in one LLS table.

Also, even if provided by the same broadcasting provider, differenttypes of signaling provided by one broadcasting provider are notcollectively stored in one LLS table for transmission. For example, theSLT metadata and the RRT metadata provided by a broadcasting providerare not transmitted in one LLS table.

That is, as illustrated in FIG. 10, the relationship between a certainbroadcasting provider and the SLT metadata, RRT metadata, timeinformation (SystemTime), or CAP metadata stored in (the payload partof) the LLS table is a one-to-one relationship. Note that in a casewhere one broadcasting provider provides a plurality of broadcastservices (services), it is possible to describe a plurality of servicesfor one SLT metadata.

The broadcast transmission path, the broadcasting provider, and the LLShave the relationship described above.

4. Initial Scan Process Flow of the Present Technology

Next, the initial scan process flow of the present technology will bedescribed with reference to flowcharts of FIGS. 11 to 14.

(Initial Scan Process)

First, with reference to the flowchart of FIG. 11, the initial scanprocess flow to be executed by the reception apparatus 20 of FIG. 1 willbe described.

In step S211, the control unit 211 monitors the operation signal and thelike from the input unit 213. In a case where an initial scan processstart event occurs, the control unit 211 starts the initial scanprocess, and the process proceeds to step S212.

In step S212, the reception unit 214 performs a frequency scan processon a frequency band of a predetermined RF channel in response to controlby the control unit 211. In step S213, it is determined whether thefrequency scan is successful by the frequency scan process in step S212.

In a case where it is determined in step S213 that the frequency scanhas failed, the process returns to the process of step S212, and thefrequency scan process is performed again. On the other hand, in a casewhere it is determined in step S213 that the frequency scan issuccessful, the process proceeds to step S214.

In step S214, an LLS acquisition process is performed. In this LLSacquisition process, an LLS table is acquired from an LLS streamtransmitted in the frequency band of the predetermined RF channel, and aprocess according to a signaling included in the LLS table is performed.Note that details of the LLS acquisition process will be described laterwith reference to the flowchart of FIG. 12.

When the LLS acquisition process is completed, the process proceeds tostep S215. In step S215, it is determined whether the frequency scan inall frequency bands is completed.

In a case where it is determined in step S215 that the frequency scan inall the frequency bands is incomplete, the process returns to step S212,and the process from step S212 is repeated. With this arrangement, thefrequency scan process is performed in each frequency band, the SLTmetadata and the RRT metadata are acquired in each frequency band, andthe channel selection information is recorded in the memory 212. Then,in a case where it is determined in step S215 that the frequency scan inall the frequency bands is completed, the frequency scan process of FIG.11 is finished.

The initial scan process flow has been described above.

(LLS Acquisition Process)

Next, with reference to the flowchart of FIG. 12, details of the LLSacquisition process corresponding to the process of step S214 of FIG. 11will be described.

In step S231, the demultiplexer 215 captures the LLS stream included inthe broadcast stream transmitted in the frequency band of thepredetermined RF channel in response to control by the control unit 211.

In step S232, a signaling acquisition process is performed. In thissignaling acquisition process, the filtering process is performed on theLLS stream captured in the process of step S231, and the signaling suchas the SLT metadata and the RRT metadata included in the LLS table isacquired.

Here, in the filtering process on the LLS stream, the broadcastingprovider (for example, broadcasting station) within the RF channel isdetermined with provider_id, a type of signaling included in the LLStable is determined with LLS_table_id, and a signaling version isdetermined with LLS_table_version. An unacquired or updated signaling isacquired and recorded, whereas an already acquired signaling isdiscarded. Note that details of the signaling acquisition process willbe described later with reference to the flowchart of FIG. 13.

When the signaling acquisition process is completed, the processproceeds to step S233. In step S233, it is determined whether a timeouthas occurred by measuring a time until the signaling included in the LLStable is acquired.

That is, in a case where the maximum transmission period of eachsignaling has elapsed, the LLS table including the signaling is regardedas not being transmitted, and a target of the frequency scan istransitioned to the frequency band of the next RF channel. Note that themaximum transmission period of each signaling is prescribed in advanceby an operating specification and the like. In other words, a case wherethe LLS table including the target signaling is not transmitted withinthe time of the maximum transmission period corresponds to a broadcasterror, and therefore the operation of the reception apparatus 20 assumedat that time is prescribed by the operation specification.

In step S233, in a case where it is determined that a timeout has notoccurred, the process returns to step S231, and the subsequent processis repeated. On the other hand, in a case where it is determined in stepS233 that a timeout has occurred, the process returns to the process ofstep S214 in FIG. 11, and the subsequent process is repeated.

The LLS acquisition process flow has been described above.

(Signaling Acquisition Process)

Next, with reference to the flowchart of FIG. 13, details of thesignaling acquisition process corresponding to the process of step S232of FIG. 12 will be described.

In step S251, the control unit 211 controls the demultiplexer 215 tocheck a value of LLS_table_id in the header part of the LLS table storedin the LLS packet included in the LLS stream, and determines a type ofsignaling included in the payload part.

As a result of determination in step S251, in a case where it isdetermined that the signaling is SLT metadata or RRT metadata, theprocess proceeds to step S252. In step S252, the control unit 211determines whether num_of_provider in the header part of the LLS tableprocessed in step S251 has already been set.

In step S252, in a case where it is determined that num_of_provider hasnot been set, the process proceeds to step S253. In step S253, thecontrol unit 211 controls the demultiplexer 215 to acquirenum_of_provider from the header part of the LLS table processed in stepS251. Also, the control unit 211 registers the number (number ofproviders) indicated by num_of_provider (number of providersinformation) acquired from the header part of the LLS table.

If the process of step S253 is finished, the process proceeds to stepS254. Also, in a case where it is determined in step S252 thatnum_of_provider has already been set, it is not necessary to registernum_of_provider again, and therefore the process of step S253 is skippedand the process proceeds to step S254.

In step S254, the control unit 211 controls the demultiplexer 215 tocheck the value of LLS_table_version in the header part of the LLS tableprocessed in step S251, and determines whether the LLS table is a newLLS table or whether the LLS table is an LLS table with an updatedversion.

In step S254, in a case where it is determined that the LLS table is anew LLS table or a LLS table with an updated version, the processproceeds to step S255. In step S255, the control unit 211 controls thedemultiplexer 215 to acquire the SLT metadata or the RRT metadata fromthe payload part of the new LLS table or the LLS table with an updatedversion. Then, the control unit 211 records, in the memory 212, theservice list of the target broadcasting provider obtained from the SLTmetadata or the RRT metadata.

In step S256, the control unit 211 determines whether acquisition of allthe signalings of the number of providers registered in the process ofstep S253 has been completed.

In a case where it is determined in step S256 that acquisition of allthe signalings of the number of providers has not been completed, theprocess returns to step S232 in FIG. 12, and the subsequent process isrepeated. That is, the process of step S232 in FIG. 12 (process of stepsS251 to S256 in FIG. 13) is repeated until all the signalings of thenumber of providers (SLT metadata or RRT metadata) are acquired andrecorded in the memory 212.

Also, in a case where it is determined in step S256 that acquisition ofall the signalings of the number of providers has been completed, theprocess returns to the process of step S214 in FIG. 11. Then, in a casewhere it is determined that the scan of all the frequency bands isincomplete (“NO” in S215 of FIG. 11), the frequency scan process on thenext frequency band is performed.

In this manner, since the number of SLT metadata and RRT metadata(number of providers) to be acquired according to the number ofproviders information (num_of_provider) in the header part of the LLStable can be identified, it becomes possible to make a transitionwithout waiting for a timeout when the frequency band in which thefrequency scan is performed is transitioned, and the frequency scan canbe performed at a higher speed.

Note that in a case where it is determined in step S254 that the LLStable is not a new LLS table or an LLS table with an updated version,the target LLS table has already been acquired, and thus the process ofsteps S255 to S256 is skipped. Then, in this case, the process returnsto step S232 in FIG. 12, and the subsequent process is repeated.

Meanwhile, in a case where it is determined that the signaling is timeinformation (SystemTime) as a result of determination in step S251, theprocess proceeds to step S257. In step S257, the control unit 211performs a system time process on the basis of the time information(SystemTime) placed in the payload part of the LLS table processed instep S251.

Also, in a case where it is determined that the signaling is CAPmetadata as a result of determination in step S251, the process proceedsto step S258. In step S258, the control unit 211 performs a CAP processon the basis of the CAP metadata placed in the payload part of the LLStable processed in step S251.

If the process of step S257 or S258 is finished, the process returns tostep S232 in FIG. 12, and the subsequent process is repeated.

The signaling acquisition process flow has been described above.

In this manner, in the initial scan process, with the number ofproviders information (num_of_provider) in the header part of the LLStable, in the frequency band of the target RF channel, the receptionapparatus 20 can recognize (identify) the number of broadcastingproviders (broadcasting stations) that provide the broadcast service(service), that is, the number of SLT metadata and RRT metadatatransmitted in the LLS stream in pre-processing that analyzes thesignaling included in the LLS table. With this arrangement, thereception apparatus 20 can identify the number of SLT metadata and RRTmetadata to be efficiently checked, and can perform the frequency scanat a higher speed without waiting for a timeout due to the maximumtransmission period of signaling.

(Transmission and Reception Process)

Finally, with reference to the flowchart of FIG. 14, a transmission andreception process flow to be executed by the transmission apparatus 10and the reception apparatus 20 of FIG. 1 will be described.

Note that in FIG. 14, the process of steps S171 to S174 is the processto be executed by the transmission apparatus 10, whereas the process ofsteps S271 to S274 is the process to be executed by the receptionapparatus 20.

In step S171, the process on components such as video, audio, andsubtitles is performed.

Here, the video data acquisition unit 112, the audio data acquisitionunit 114, and the subtitles data acquisition unit 116 acquire videodata, audio data, and subtitles data, respectively. The video processingunit 113, the audio processing unit 115, and the subtitles processingunit 117 perform processes such as an encoding process on the videodata, the audio data, and the subtitles data, respectively.

In step S172, the process on the signaling is performed.

Here, the signaling is generated by the signaling generation unit 118,and a predetermined process is performed on the signaling by thesignaling processing unit 119. Note that in a case where the LLS tableincluding the signaling such as the SLT metadata and the RRT metadata inthe payload part is generated, in addition to LLS_table_id, provider_id,and LLS_table_version, num_of_provider as the number of providersinformation is included in the header part.

In step S173, the multiplexer 120 multiplexes the component streamobtained in the process of step S171 and the signaling stream obtainedin the process of step S172 to obtain the multiplexed stream.

In step S174, the transmission unit 121 performs processes such as amodulation process on the multiplexed stream obtained in the process ofstep S173, and transmits the resulting broadcast stream as a broadcastwave of digital broadcasting via the antenna 131.

In step S271, the reception unit 214 receives the broadcast wave ofdigital broadcasting via the antenna 231. The reception unit 214performs processes such as a demodulation process on the broadcaststream obtained from the broadcast wave to obtain the multiplexedstream.

In step S272, the demultiplexer 215 separates the multiplexed streamobtained in the process of step S271 and obtains the component streamand the signaling stream.

In step S273, the process on the signaling obtained in the process ofstep S272 is performed.

Here, in a case where the initial scan process or the rescan process isperformed, the channel selection information obtained from the signaling(LLS) is acquired by the control unit 211 and recorded in the memory212. In this initial scan process and the rescan process, as describedwith reference to FIGS. 8 and 9 and FIGS. 11 to 13, the frequency scanis performed in each frequency band of the RF channel by using thenumber of providers information (num_of_provider) included in the headerpart of the LLS table.

Also, in a case where the service selection process is performed, thecontrol unit 211 controls the demultiplexer 215 and the like on thebasis of the channel selection information recorded in the memory 212,and processes the signaling (SLS) of the service to be selected.

In step S274, the process on the component such as video, audio, andsubtitles obtained in the process of step S272 is performed.

Here, in a case where the service selection process is performed, thecontrol unit 211 controls the demultiplexer 215, the processing unit ofeach component, and the like, and content of the service to be selected(such as a broadcast program) is reproduced. That is, the videoprocessing unit 216, the audio processing unit 218, and the subtitlesprocessing unit 220 perform processes such as the decoding process, andthe video output unit 217 and the audio output unit 219 output videodata, audio data, and subtitles data.

The transmission and reception process flow has been described above.

5. Modification

ATSC (in particular, ATSC 3.0) that is a method employed in countriessuch as the United States has been mentioned in the above description asa standard for digital broadcasting; however, the present technology maybe applied to integrated services digital broadcasting (ISDB) that is amethod employed in countries such as Japan, digital video broadcasting(DVB) that is a method employed in respective countries such as Europeancountries, and other methods. Also, ATSC 3.0 in which the IPtransmission method is employed has been mentioned as an example in theabove description; however, the present technology may be applied notonly to the IP transmission method but also to other methods such as anMPEG2-transport stream (TS) method, for example.

Also, as standards for digital broadcasting, in addition to terrestrialbroadcasting, the present technology is also applicable to standardssuch as satellite broadcasting using a satellite such as a broadcastingsatellite (BS) and a communication satellite (CS), and cablebroadcasting such as cable television (CATV).

Moreover, names described above such as signaling and packet are merelyone example, and other names may be used in some cases. However, adifference between these names is a perfunctory difference, andsubstantial details such as the target signaling and packet are notdifferent. For example, an ATSC link-layer protocol (ALP) packet may bereferred to as a generic packet, a type length value (TLV) packet, orsome other packet in some cases. Furthermore, non real time (NRT) may bereferred to as locally cached content (LCC) or the like.

Furthermore, the present technology is also applicable to apredetermined standard (standard other than the standard of digitalbroadcasting) and the like prescribed on the assumption that atransmission path other than a broadcasting network is used as atransmission path, that is, for example, a communication line(communication network) or the like such as the Internet and a telephonenetwork. In that case, the communication line such as the Internet and atelephone network is used as the transmission path 30 of thetransmission system 1 (FIG. 1), and the transmission apparatus 10 can bea server provided on the Internet. Then, the communication server andthe reception apparatus 20 perform bidirectional communication via thetransmission path 30 (communication line).

6. Configuration of Computer

A series of processes described above can be executed by hardware andcan also be executed by software. In a case where the series ofprocesses is executed by software, a program constituting the softwareis installed in a computer. FIG. 15 is a diagram illustrating aconfiguration example of hardware of a computer that executes theabove-described series of processes by the program.

In a computer 1000, a central processing unit (CPU) 1001, a read onlymemory (ROM) 1002, and a random access memory (RAM) 1003 are connectedto each other via a bus 1004. An input output interface 1005 is furtherconnected to the bus 1004. An input unit 1006, an output unit 1007, arecording unit 1008, a communication unit 1009, and a drive 1010 areconnected to the input output interface 1005.

The input unit 1006 includes a keyboard, a mouse, a microphone, or thelike. The output unit 1007 includes a display, a speaker, or the like.The recording unit 1008 includes a hard disk, a nonvolatile memory, orthe like. The communication unit 1009 includes a network interface orthe like. The drive 1010 drives a removable recording medium 1011 suchas a magnetic disk, an optical disk, a magneto-optical disk, or asemiconductor memory.

In the computer 1000 configured as described above, the CPU 1001 loads aprogram recorded in the ROM 1002 or the recording unit 1008 into the RAM1003 via the input output interface 1005 and the bus 1004, and executesthe program, thereby executing the series of processes described above.

The program to be executed by the computer 1000 (CPU 1001) can berecorded and provided, for example, in a removable recording medium 1011that serves as a package medium or the like. Also, the program can beprovided via a wired or wireless transmission medium such as a localarea network, the Internet, and digital satellite broadcasting.

In the computer 1000, the program can be installed in the recording unit1008 via the input output interface 1005 by attaching the removablerecording medium 1011 to the drive 1010. Also, the program can bereceived by the communication unit 1009 via the wired or wirelesstransmission medium and installed in the recording unit 1008. Inaddition, the program can be installed in the ROM 1002 or the recordingunit 1008 in advance.

Here, in this specification, the process to be executed by the computerin accordance with the program does not necessarily have to be performedin chronological order in accordance with order described as theflowchart. That is, the process to be executed by the computer inaccordance with the program also includes processes that are executed inparallel or individually (for example, parallel processing or processingby an object). Furthermore, the program may be processed by one computer(processor) and may undergo distributed processing by a plurality ofcomputers.

Note that the embodiment of the present technology is not limited to theembodiment described above, and various modifications may be madewithout departing from the spirit of the present technology.

Furthermore, the present technology can have the followingconfigurations.

(1) A reception apparatus including:

a reception unit configured to receive a broadcast wave; and

a control unit configured to perform a frequency scan on the broadcastwave on the basis of the number of providers information indicating thenumber of broadcasting providers providing a service in the samefrequency band to generate channel selection information for selectingthe service.

(2) The reception apparatus according to (1), in which the number ofproviders information indicates the number of broadcasting providers ina case where one or more broadcasting providers provide one or moreservices in the same frequency band.

(3) The reception apparatus according to (1) or (2), in which the numberof providers information is included in a header part added to a tablethat allows control information including information regarding channelselection of the service to be stored in a payload part.(4) The reception apparatus according to (3), in which the table istransmitted for each of the broadcasting providers.(5) The reception apparatus according to (3) or (4), in which

the table is transmitted in an Internet Protocol (IP) packet including auser datagram protocol (UDP) packet, and

the table is identified with a fixed IP address and a fixed port number.

(6) The reception apparatus according to any of (3) to (5), in which ina case where the control information according to the number ofbroadcasting providers indicated by the number of providers informationis acquired by the frequency scan in a certain frequency band, thecontrol unit transitions to a next frequency band and performs thefrequency scan.(7) A data processing method for a reception apparatus, the dataprocessing method including the steps of, by the reception apparatus:

receiving a broadcast wave; and

performing a frequency scan on the broadcast wave on the basis of thenumber of providers information indicating the number of broadcastingproviders providing a service in the same frequency band to generatechannel selection information for selecting the service.

(8) A transmission apparatus including:

a generation unit configured to generate the number of providersinformation indicating the number of broadcasting providers providing aservice in the same frequency band; and

a transmission unit configured to transmit the generated number ofproviders information by a broadcast wave.

(9) The transmission apparatus according to (8), in which the number ofproviders information indicates the number of broadcasting providers ina case where one or more broadcasting providers provide one or moreservices in the same frequency band.

(10) The transmission apparatus according to (8) or (9), in which thenumber of providers information is included in a header part added to atable that allows control information including information regardingchannel selection of the service to be stored in a payload part.(11) The transmission apparatus according to (10), in which the table istransmitted for each of the broadcasting providers.(12) The transmission apparatus according to (10) or (11), in which

the table is transmitted in an IP packet including a UDP packet, and

the table is identified with a fixed IP address and a fixed port number.

(13) The transmission apparatus according to any of (10) to (12), inwhich the transmission unit transmits content together with the controlinformation by the broadcast wave.

(14) A data processing method for a transmission apparatus, the dataprocessing method including the steps of, by the transmission apparatus:

generating the number of providers information indicating the number ofbroadcasting providers providing a service in the same frequency band;and

transmitting the generated number of providers information by abroadcast wave.

REFERENCE SIGNS LIST

-   1 Transmission system-   10 Transmission apparatus-   20 Reception apparatus-   30 Transmission path-   111 Control unit-   112 Video data acquisition unit-   113 Video data processing unit-   114 Audio data acquisition unit-   115 Audio data processing unit-   116 Subtitles data acquisition unit-   117 Subtitles processing unit-   118 Signaling generation unit-   119 Signaling processing unit-   120 Multiplexer-   121 Transmission unit-   211 Control unit-   212 Memory-   213 Input unit-   214 Reception unit-   215 Demultiplexer-   216 Video processing unit-   217 Video output unit-   218 Audio processing unit-   219 Audio output unit-   220 Subtitles processing unit-   221 Display unit-   222 Speaker-   1000 Computer-   1001 CPU

The invention claimed is:
 1. A reception apparatus comprising: circuitryconfigured to: receive one or more low level signaling (LLS) tables thatinclude one or more respective service list tables (SLTs) from a firstLLS stream in a broadcast stream, each of the one or more LLS tablesincluding a provider identifier indicating a provider with which therespective LLS table is associated, and a numerical parameter indicatinga number of different provider identifiers included in the first LLSstream; upon receipt of each one of the one or more LLS tables,determine receipt of a first set of service list information from thefirst LLS stream is completed in a case that currently received LLStable or tables have a current number of different provider identifiersreaching the number of different provider identifiers indicated by thenumerical parameter, and determine the receipt of the first set ofservice list information from the first LLS stream is completed in acase that a maximum transmission period after receipt of a first one ofthe one of the one or more LLS tables has elapsed and the current numberof different provider identifiers has not reached the number ofdifferent provider identifiers indicated by the numerical parameter;receive a second set of service list information from a second LLSstream instead of the first LLS stream in response to the receipt of thefirst set of service list information from the first LLS stream beingdetermined as completed; and generate service information based on thefirst set of service list information and the second set of service listinformation.
 2. The reception apparatus according to claim 1, whereinone of the one or more LLS tables from the first LLS stream includes: aheader part that includes a table identifier and the numericalparameter; and a payload part that includes one of the SLTs, whichincludes a piece of service list information indicating one or moreservices that are provided in the broadcast stream.
 3. The receptionapparatus according to claim 2, wherein the one of the one or more LLStables is transmitted in a user datagram protocol (UDP) over an InternetProtocol (IP) packet stream, and the one of the one or more LLS tablesis identified with a fixed IP address and a fixed port number.
 4. Thereception apparatus according to claim 2, wherein the header part of theone of the one or more LLS tables further includes: table versioninformation indicating a version of the one of the one or more LLStables.
 5. The reception apparatus according to claim 1, wherein thefirst LLS stream is included in a physical layer pipe (PLP) in thebroadcast stream.
 6. A data processing method for a reception apparatus,the data processing method comprising: receiving, by circuitry of thereception apparatus, one or more low level signaling (LLS) tables thatinclude one or more respective service list tables (SLTs) from a firstLLS stream in a broadcast stream, each of the one or more LLS tablesincluding a provider identifier indicating a provider with which therespective LLS table is associated, and a numerical parameter indicatinga number of different provider identifiers included in the first LLSstream; upon receipt of each one of the one or more LLS tables,determining, by the circuitry of the reception apparatus, receipt of afirst set of service list information from the first LLS stream iscompleted in a case that currently received LLS table or tables have acurrent number of different provider identifiers reaching the number ofdifferent provider identifiers indicated by the numerical parameter, anddetermining the receipt of the first set of service list informationfrom the first LLS stream is completed in a case that a maximumtransmission period after receipt of a first one of the one of the oneor more LLS tables has elapsed and the current number of differentprovider identifiers has not reached the number of different provideridentifiers indicated by the numerical parameter; receiving, by thecircuitry of the reception apparatus, a second set of service listinformation from a second LLS stream instead of the first LLS stream inresponse to the receipt of the first set of service list informationfrom the first LLS stream being determined as completed; and generating,by the circuitry of the reception apparatus, service information basedon the first set of service list information and the second set ofservice list information.
 7. The data processing method according toclaim 6, wherein one of the one or more LLS tables from the first LLSstream includes: a header part that includes a table identifier and thenumerical parameter; and a payload part that includes one of the SLTs,which includes a piece of service list information indicating one ormore services that are provided in the broadcast stream.
 8. Atransmission apparatus comprising: circuitry configured to: generate oneor more low level signaling (LLS) tables that include one or morerespective service list tables (SLTs) to be transmitted via a first LLSstream in a broadcast stream, each of the one or more LLS tablesincluding a provider identifier indicating a provider with which therespective LLS table is associated, and a numerical parameter indicatinga number of different provider identifiers included in the first LLSstream; and transmit the generated one or more LLS tables via the firstLLS stream in the broadcast stream, wherein the one or more LLS tablescause a reception apparatus to switch from receiving a first set ofservice list information from the first LLS stream to receiving a secondset of service list information from a second LLS stream in response tothe reception apparatus determining reception of the first set ofservice list information from the first LLS stream is completed (i) in acase that received LLS table or tables received by the receptionapparatus have a current number of different provider identifiersreaching the number of different provider identifiers indicated by thenumerical parameter, and (ii) in a case that a maximum transmissionperiod after receipt of a first one of the one of the one or more LLStables has elapsed and the current number of different provideridentifiers has not reached the number of different provider identifiersindicated by the numerical parameter.
 9. The transmission apparatusaccording to claim 8, wherein one of the one or more LLS tablesincludes: a header part that includes a table identifier and thenumerical parameter; and a payload part that includes one of the SLTs,which includes a piece of service list information indicating one ormore services that are provided in the broadcast stream.
 10. Thetransmission apparatus according to claim 9, wherein the one of the oneor more LLS tables is transmitted in a user datagram protocol (UDP) overan Internet Protocol (IP) packet stream, and the one of the one or moreLLS tables is identified with a fixed IP address and a fixed portnumber.
 11. A data processing method for a transmission apparatus, thedata processing method comprising: generating one or more low levelsignaling (LLS) tables that include one or more respective service listtables (SLTs) to be transmitted via a first LLS stream in a broadcaststream, each of the one or more LLS tables including a provideridentifier indicating a provider with which the respective LLS table isassociated, and a numerical parameter indicating a number of differentprovider identifiers included in the first LLS stream; and transmittingthe generated one or more LLS tables via the first LLS stream in thebroadcast stream, wherein the one or more LLS tables cause a receptionapparatus to switch from receiving a first set of service listinformation from the first LLS stream to receiving a second set ofservice list information from a second LLS stream in response to thereception apparatus determining reception of the first set of servicelist information from the first LLS stream is completed (i) in a casethat received LLS table or tables received by the reception apparatushave a current number of different provider identifiers reaching thenumber of different provider identifiers indicated by the numericalparameter and (ii) in a case that a maximum transmission period afterreceipt of a first one of the one of the one or more LLS tables haselapsed and the current number of different provider identifiers has notreached the number of different provider identifiers indicated by thenumerical parameter.
 12. The data processing method according to claim11, wherein one of the one or more LLS tables includes: a header partthat includes a table identifier and the numerical parameter; and apayload part that includes one of the SLTs, which includes a piece ofservice list information indicating one or more services that areprovided in the broadcast stream.